Valve construction



R. WEHR I 1,791,778

Feb. 10, 1931.

Patented Feb. 10, 1931 UNITED STATES. PAT

RUDOLPH WEHR, OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO THE WEEK MOTOR COMPANY, A CORIO.RATION OF CALIFORNIA VALVE CONSTRUCTION v I P Application filed April ,15,

- will effectively be'prevented.

It accordingly is an object of my invention to provide a novel form of packing shoes for continually urging the rotary valve into contact with its casing to compensate for temperature and wear changes, each of said shoes being also provided with means whereby un even wear thereof will effectively be obviated, and buckling of said shoes will be prevented. A further object of my invention is to position the rotary valve of an internal combustion engine in its casing so that a line of contact between the inlet and cylinder ports of less than 180 degrees will be continually maintained between the periphery of said valve and its casing, packingmeans for accomplishing this being also associated with said valve. g The above and further objects and advantages of my invention, as will hereinafter more fully appear, I attain by the construction describedlin the specification and illustrated on the drawings forming a part of my application. V i 7 Reference is had to the accompanylng drawings, in which similar reference char-- acters denote similar parts. In the drawings, Fig. l is a cross-sectional view through the valve casing showing my novel form of packing shoes,

Fig. 2 is a top plan view of the upper packing shoe,

Fig. 3 is a cross-sectional view taken in the line 33, Fig. 2,

Fig. 4 is a bottom plan view of the lower packing shoe,

Fig. 5 is a side elevational view of the packing means for the slots in the lower shoe, and

Fig. 6 is a more or less fragmentary dia grammatic cross-sectional view illustrating in an exaggerated way the position of the valve with respect to its casing.

Describing my invention more in detail,

1929. Serial No. 355,062.

it sometimes happens that the packing shoes associated with the rotary-valve of an internal combustion engine are inaccurately machined, and in consequence may'be sub jected to buckling, it accordingly is' one of my objects to provide said shoes with a means whereby this objectionable feature may be effectively prevented.

It is, moreover, a desideratum that an accurate line of peripheral contact between the valve and its'casin'g be continually maintained between the inlet and cylinder ports, and to thisend I so positionthe valve in its casing that there will be a continual line con-' tactof less than 180 degrees'between the valve and its casing. i I

-l\5[ore specifically, the valve casing 2, is equipped-with an inlet port'4 and an exhaust port 6, the rotary valve 8 being adapted periodically to control said ports and the cylinder port 10, saidvalve being so positioned relatively to the casing Q that there will be a'peripheral line contact between said casing of lessthan 180 degrees to the right thereof, to insure that there will be no leak age from the inlet to the" exhaust, asmall EN T OFFICE f clearance space 12, shown'ineXaggerated form in Fig. 6, being provided to the left of the valve and casing.

To this'end, the axis of the valve 8 is positioned slightly ofiset with respect to the axis of the valve casing, and'the shoes 14 and 16 coact to push'said valve toward the right in Fig; 6-, when the valve is rotatedas indicated by the arrow in Fig. 1. This causes a continuous" line contact of the periphery of the valve 8 with the inner valve casing wall beginning with a point substantially from the left of the port 10 to a trifle less than one-V half the inner surface of theshoe 16; in other words, less than 180, thus permittingthe port 10 to becentrally positioned with respect to the cylinder of the engine. To continual-1y urge the valve 8 to the eccentric position shown in Fig. 6, and to compensate for temperature and wear changes, I provide a pair of relatively slidable packing shoes 14 and 16, maintained in con tinual sliding engagement with each other and with the valve 8, which shoesare held in such engagement by means of the adjustable spring construction 18.

In practice it sometimes happens that the shoes 14 and 16 are improperly machined, and accordingly are subjected to uneven wear and buckling. To prevent this I provide the upper'shoe 14 with the cut-away or cut-out portions 20, which elfectively prevent the ends of said shoe from curling upward, a passage 22 being provided forintroducing a lubricant between the shoes 14. and 16. It will, of course, be understood that the character and depth of cut of said cut-away or cut-out portions may be any that in practice is required.

To prevent uneven wear and buckling on the lower shoe 16, I make said shoe more elasticby providing at least one slot or groove 24=1on the lower valve engaging surface there- .of, and in said slot or groove, I position the packing member or means26 (Fig. which is preferably constructed of a heat non-conducting material, such as asbestos or asbestos cenlposition.

In operation, the valve being rotated in the direction. of thearrow shown in Fig, 1, the spring construction 18willf continually urge the shoes 14, and 16 into sliding engagement,

the shoe '16, being held in continual engagement with the valve 8, which is held in peripheral line contact with the inner wall of the casing 2, said linecontact being, lesszthan 180 degrees, to, insure thatcthere will be no leakage between the inlet, and exhaust ports, a small clearance space 12being thus pro vided between the leftportion of the casing and the valve. The cut-away or cut-out portions in the shoe 14, and the grooves or slots 24-, as hereinbefore stated, preventing effectively uneven wear and bucklin VVhile I have thus describedmy invention with'great particularity, it will be clear that the samemay be modified throughout a wide range. I accordingly do-notpropose to be limited to the exact details ofconstruction sho-wn and. described, but reserve the right in practice to make any and all modifications thereof that fall within the scope of. the appended claims.

I claim as my. invention: v

1. In a valve constructionin combination with a, rotaryv valve, of a pair of relatively movable packingshoes for compensating for temperature and wear changes, to which said 'valve is subjected, each of said shoes being provided with freely movable means unconnected to said valve casing for rendering one of said shoes more elastic, whereby the wear due to inaccurate machining will becompensatedfor. I V p 2. In avalve constructiom in combination withv a-rotary valve, of a; pair of relatively slid able packing shoes for compensating for temperatureand wear changes to which said valve is subjected,one of said shoes being provided with cut-away portions, and the provided with at least one slot, tofprevent each of vsaidi shoes from! buckling, and packing means in each of sald slots.

-4.'--In a valve construction, in combination,

a valvecasing, a valve adapted for rotation 1n said casing, saldyalve be1ng eccentrically positionedin said casing that a line of contact will be continually maintainedv between said valve casing and said valve, between the inlet port of said; casing and thecylinder port controlled by said valve, and packing means for continually urging said valve into, said contact.

V 5. In an internal combustion engine, in combination, a valve casing, a. rotary valve in said casing, saidv valve being. eccentrically positioned in said casing that a lineofcontact will be continually maintained; between said Valve and saidlcasing between the inlet port of said. easingand the cylinder port controlled by said valve, said. line ofgcontactbeing lessthan one hundred and eighty, degrees, and-packing means for I continually urging said, valve intosaidcontact. i

6. Inavalve construction, a valvecasing, a rotary valve in said casing, said'valve being eccentrically positioned in said casing so said valve will be in continual engagement with said casingfor less than one hundred and eighty degrees of its periphery, andmeans for continually urgingsaid valve into said ngag m nt- 7 Ina valve construction, 'a packing shoe provided withat least one groove for preventing buck-ling when said shoe is used in connection withthe rotary valve of aminternal combustion engine.

8. In a valve construction, a'packing shoe provided with at least one slot for preventing uneven Wear and buckling when saidshoe'is used in connection with the rotary valve H Of. an lnternal combustion engine, and a 

